This massive herbaceous shrub needs a lot of room to show off its vase-shaped form, but it does not spread or self-sow like some of its relatives. It blooms close to the ground from June and continues throughout the summer atop 6-foot-tall stems. The large, white, astilbe-like blossoms fade to pink and then reddish-brown as the season comes to a close.

Noteworthy Characteristics: Persicaria are rhizomatous or stoloniferous plants that are spreading and sometimes invasive. They have fleshy stems and conspicuously veined leaves, some of which exhibit autumn color. Many are suitable in a mixed container or border, others naturalized in a woodland or meadow. All plant parts may cause skin irritation on contact and stomach upset if ingested.

Care: It prefers moist soil but can tolerate some shade and dry conditions.

Propagation: Divide in spring or fall. Sow seed in spring in a cold frame.